(a)
The weather radar control panel microcomputer and its associated components accept the buffered parallel data taken from the control panel switches and controls and converts it into serial data for the ARINC 429 transmitter. Thus, under program control the switch and control inputs are examined and two 32 bit words are assembled. Control word number one from the weather radar control panel is sent to the R/T ARINC 429 interface circuits.
(b)
The radar operating modes selectable on the radar control panel are as follows: 1) WX (weather) - Places weather radar system in the normal
weather detection mode of operation. The EHSI shows areas of significant rainfall as colored areas on the display. Areas of heaviest rainfall will appear in red, the next lower level of rainfall in yellow, the next level is green.
2) WX+T (turbulence) - Normal weather detection is made and displayed in the same manner as the WX mode except targets (green, yellow, red), within 50NM, containing turbulence will be displayed in magenta (Fig. 4).
3) IDNT (ground clutter suppression) - Provides ground clutter suppression in WX and WX/T or WX+T modes.
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MAINTENANCE MANUAL
M62 ANTENNA ASSEMBLY (STA 178)
Weather Radar System Schematic Figure 4 (Sheet 2)
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ANTENNA
(SHT 5)TO LEFIS SYM(SHT 5)
TO REFIS SYM(SHT 5)
TO/FROMANTENNA(SHT 5)
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4) MAP - Depending on the setting of the TILT control, a terrain mapping effect is displayed for identifying terrain features. The colors green, yellow, and red represent increasing levels of return for the radar in the MAP mode. The system gain is selectable in the MAP mode by the use of the GAIN control on the weather radar control panel.
5) TEST - Activates the test mode for the system. Initially, the transmitter is enabled for less than 1 second and then muted for the remainder of the test. A test pattern is generated containing four concentric arcs with magenta, red, yellow, and green displayed from top to bottom. An Antenna test sequence is automatically performed. A complete left-to-right scan and up-to-down tilt cycle will occur, with the tilt angle displayed on the EHSIs.
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